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authorLennert Buytenhek <buytenh@wantstofly.org>2006-06-27 22:56:18 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-06-28 17:54:59 +0100
commit3bec6ded282b331552587267d67a06ed7fd95ddd (patch)
tree5333fa3e3322528e3d8e5074d41ffc7f538f6768
parent562ca1e32a9c2514551559691db809606502a15a (diff)
[ARM] 3664/1: crunch: add signal frame save/restore
Patch from Lennert Buytenhek This patch makes the kernel save Crunch state in userland signal frames, so that any userland signal handler can safely use the Crunch coprocessor without corrupting the Crunch state of the code it preempted. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/kernel/signal.c39
-rw-r--r--include/asm-arm/ucontext.h14
2 files changed, 53 insertions, 0 deletions
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index 1ce05ec086c..83a8d3c95eb 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -132,6 +132,37 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
return ret;
}
+#ifdef CONFIG_CRUNCH
+static int preserve_crunch_context(struct crunch_sigframe *frame)
+{
+ char kbuf[sizeof(*frame) + 8];
+ struct crunch_sigframe *kframe;
+
+ /* the crunch context must be 64 bit aligned */
+ kframe = (struct crunch_sigframe *)((unsigned long)(kbuf + 8) & ~7);
+ kframe->magic = CRUNCH_MAGIC;
+ kframe->size = CRUNCH_STORAGE_SIZE;
+ crunch_task_copy(current_thread_info(), &kframe->storage);
+ return __copy_to_user(frame, kframe, sizeof(*frame));
+}
+
+static int restore_crunch_context(struct crunch_sigframe *frame)
+{
+ char kbuf[sizeof(*frame) + 8];
+ struct crunch_sigframe *kframe;
+
+ /* the crunch context must be 64 bit aligned */
+ kframe = (struct crunch_sigframe *)((unsigned long)(kbuf + 8) & ~7);
+ if (__copy_from_user(kframe, frame, sizeof(*frame)))
+ return -1;
+ if (kframe->magic != CRUNCH_MAGIC ||
+ kframe->size != CRUNCH_STORAGE_SIZE)
+ return -1;
+ crunch_task_restore(current_thread_info(), &kframe->storage);
+ return 0;
+}
+#endif
+
#ifdef CONFIG_IWMMXT
static int preserve_iwmmxt_context(struct iwmmxt_sigframe *frame)
@@ -214,6 +245,10 @@ static int restore_sigframe(struct pt_regs *regs, struct sigframe __user *sf)
err |= !valid_user_regs(regs);
aux = (struct aux_sigframe __user *) sf->uc.uc_regspace;
+#ifdef CONFIG_CRUNCH
+ if (err == 0)
+ err |= restore_crunch_context(&aux->crunch);
+#endif
#ifdef CONFIG_IWMMXT
if (err == 0 && test_thread_flag(TIF_USING_IWMMXT))
err |= restore_iwmmxt_context(&aux->iwmmxt);
@@ -333,6 +368,10 @@ setup_sigframe(struct sigframe __user *sf, struct pt_regs *regs, sigset_t *set)
err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(*set));
aux = (struct aux_sigframe __user *) sf->uc.uc_regspace;
+#ifdef CONFIG_CRUNCH
+ if (err == 0)
+ err |= preserve_crunch_context(&aux->crunch);
+#endif
#ifdef CONFIG_IWMMXT
if (err == 0 && test_thread_flag(TIF_USING_IWMMXT))
err |= preserve_iwmmxt_context(&aux->iwmmxt);
diff --git a/include/asm-arm/ucontext.h b/include/asm-arm/ucontext.h
index 9e6f7ca9f5a..bf65e9f4525 100644
--- a/include/asm-arm/ucontext.h
+++ b/include/asm-arm/ucontext.h
@@ -35,6 +35,17 @@ struct ucontext {
* bytes, to prevent unpredictable padding in the signal frame.
*/
+#ifdef CONFIG_CRUNCH
+#define CRUNCH_MAGIC 0x5065cf03
+#define CRUNCH_STORAGE_SIZE (CRUNCH_SIZE + 8)
+
+struct crunch_sigframe {
+ unsigned long magic;
+ unsigned long size;
+ struct crunch_state storage;
+} __attribute__((__aligned__(8)));
+#endif
+
#ifdef CONFIG_IWMMXT
/* iwmmxt_area is 0x98 bytes long, preceeded by 8 bytes of signature */
#define IWMMXT_MAGIC 0x12ef842a
@@ -74,6 +85,9 @@ struct vfp_sigframe
* one of these.
*/
struct aux_sigframe {
+#ifdef CONFIG_CRUNCH
+ struct crunch_sigframe crunch;
+#endif
#ifdef CONFIG_IWMMXT
struct iwmmxt_sigframe iwmmxt;
#endif